ResourceBundle in Java 9 Module

[Rabea Gransberger]

Hello,

while migrating example code to Java 9 Modules I ran into a problem:

ResourceBundle bundle = ResourceBundle.getBundle("de.rgra.nl.messages");
System.out.println(bundle.getString("I18n.message"));

The properties file path is:
src\de\rgra\nl\messages.properties

The code works on Java 8 and 9 when used on the Classpath.

It fails in Java 9 when used in a module on the Modulepath with:

Exception in thread "main" java.lang.NoClassDefFoundError: 
de/rgra/nl/Messages (wrong name: de/rgra/nl/messages)

Changing it to uppercase M will work on Classpath and Modulepath 
(without changing the properties file to uppercase M):

ResourceBundle bundle = ResourceBundle.getBundle("de.rgra.nl.Messages");
System.out.println(bundle.getString("I18n.message"));

Can anybody explain to me why this happens?

The example with run script can be found at:
https://github.com/rgra/java9-module-refactoring/tree/master/resourcebundle



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